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Credit: Getty Images

WASHINGTON, DC - DECEMBER 9: (AFP OUT) U.S. President Barack Obama shakes hands with South Korean musician PSY (C), next to host Conan O'Brien (L) and performer Scotty McCreery (R) during the "Christmas in Washington" concert at the National Building Museum on December 9, 2012 in Washington, D.C. The concert benefits the National Childrens Medical Center and is hosted by comedian Conan O'Brien. (Molly Riley-Pool/Getty Images)